I would guess that she could be going through a growing spurt.  Breastfeeding works on the laws of supply and demand.  The more she nurses, the more milk you will produce.  You may get a little sore if she is trying to nurse constantly so get some lanolin cream if you don’t have some already.  There is a tea that you can buy in most health food sections (Fred Meyer carries it) called Mother’s Milk tea.  It is very safe and has the herbs Jessica was talking about.  My five month old son is my 2nd baby and both were breastfed exclusively for 9 months.  It isn’t always easy - hang in there! Let me know if you need more info or help.

Janell